Turret-lathe.



G. B. ATWOOD.

TURRET LATHE.

APPLICATION FILED 0OT.1, 190B.

Patented July 29, 1913.

2 SHEETS-SHEET 1.

C. B. ATWOOD.

TURRET LATHE.

APPLICATION FILED OCT. 1, 1908' Patented July 29, 1913.

2 SHEETS-SHEET 2 TE srarns Par FTQE.

CLARENCE IB. ATWOOD, OF BELVIDERE, ILLINOIS, ASSIGNOR TO NATIONAL SEWINGMACHINE COMPANY, OF BELVIDERE, ILLINOIS, A CORPORATION OF ILLINOIS.

TUBRET-LATHE.

Specification of Letters Patent.

Application filed. Ostober 1, 1908.

Patented July 29, 1913. Serial No. 455,772.

To all whom it may concern:

Be it known that I, CLARENCE B. A'rwoon, a citizen of the United States,residing at Belvidere, in the county of Boone and State of Illinois,have invented certain new and useful Improvements in Turret-Lathes, ofwhich the following is a full, clear, and exact specification.

This invention relates to that class of lathes ordinarily known asturret lathes because of the rotary character of the tool carrier forcarrying a plurality of tools all adapted to perform their work at thesame center successively and the invention has for one of its importantobjects to arrange the tool carrier, which may be called the turret inthis application by virtue of its analogy or function to the turretsheretofore used, in a horizontal position so that it will rotate uponthe horizontal axis and the tools while in use may therefore be situatedin a verv low position with relation to the bed of the machine orsupport upon which the tool carriage slides, thereby reducing to theminimum the sheet of the strain sustained by the turret While in use andbringing the strains lengthwise of the axis of rotation of the turretinstead of transversely thereof and consequently also reducing to theminimum the tendency of such strain to throw the tool out of line withthe work.

A further object of the invention is to very materially enlarge thebearings for the tun ret, whereby the lost motion due to Wear will bereduced and the turret rendered more stable.

With a view to the attainment of these ends and the accomplishment ofcertain other objects which will hereinafter appear, the inventionconsists in the features of novelty which will now be described withreference to the accompanying drawings and which are shown in saiddrawings and more particularly pointed out in the claim.

In the said drawings, Figure 1 is a vertical longitudinal sectional viewof a portion of a turret lathe embodying this invention. Fig. 2 is anenlarged side elevation of the turret showing its mounting and operatingmechanism in section. Fig. 3 is a transverse section thereof on the line33 of Fig. 2. Fig. 4 is an enlarged detail view of the pawl and ratchetmechanism for rotating the turret, and Fig. 5 is a detail perspectiveview of a cam plate hereinafter described.

1 is the bed of the lathe upon which is mounted the usual chuck 2 forcarrying and rotating the work while it is operated upon one of thetools carried in one of the various sockets or tool holders 3 formed inthe turret head shown at 4, and which in this instance is arranged in ahorizontal position so as to rotate on a horizontal axis whereby thetool holders 3 will come successively into line with the center of thechuck 2.

5 is the carriage which carries the turret head 4 and which is providedwith bearings 6, 7, in which the head 4 is jo-urnaled, the latter beingprovided near one end with an end thrust bearing shoulder 8 which abutsagainst the bearing 7 and resists the longitudinal movement of the head4 in one directlon or sustains the thrust induced bv the pressure of thetool against the work, while the movement of the head 4 in the oppositedirection is limited by a collar 9 screw,

threaded upon the head and abutting against the bearing 6, this collarbeing split and provided with a screw 10 whereby it may be tightened sothat the lost motion due to wear of the shoulder 8 against the bearing 7may be taken up.

In order that the turret head 4 may be given the usual intermittent orstep by step rotary motion it may be provided with the usual or anysuitable ratchet mechanism but I prefer to employ the form which isshown in the drawings comprising as many pins 11 projecting from therear end of the head 4 as there are tool holders or sockets 3, in thisinstance four being shown, and a pawl 12 which is carried by an arm 13and successively engages the pins 11 for intermittently rotating thehead. The pawl arm 13 ispivotally mounted upon a stud 14 projecting fromthe rear end of the head 4 and interposed between this arm and the headis a roller 15 upon which the extremity of the pawl 12 rides while inmotion. The hub of the arm 13 is formed with a toothed segment 16, whichis engaged by a segment rack 17 secured in a guide 18 on the upper endof a rod 19. The lower end of this rod is engaged by one end of a lever20 so that when the lever is oscillated the rod will be reciprocated andthe segment rack 16 thereby rotated upon its pivotal support, and tothat end the lever 20 is formed with a rounded head 21 and the lower endof the rod 19 with a suitable bearing slot 22 in which the head 21engages. oted to the carriage 5 in a suitable recess 23 and is providedwith a laterally projecting stud 26 adapted to engage alternately withtwo cams 27, 28, formed on a cam plate 29 secured to the bed 1 beneaththe carriage 5. Consequently, as the carriage 5 is re-.

ciprocated by the usual or any suitable means, such as a cam 30,engaging a stud 31 on the bottom of the carriage, the rod 19 will bemoved up and down. It will be moved upward when the stud 26 engages thecam or incline 27 and will be moved clownward when it engages theincline or cam 28 and during these motions the pawl 12 will be caused tosuccessively engage the pins 11 and rotate the head l. During thisoscillatory motion of the pawl it is held toward the pins by a spring 32which yields to allow the pawl to slide backward over the next pin. Theenga 'ing face of the pawl is of the peculiar siape better shown in Fig.l. Its extreme end is recessed as shown at 33 to conform to the contourof the pins 11, and extending from this recessed end in the direction ofthe pivotal point of the pawl is a earn or incline 34, which comesagainst the side of the pin past which the pawl is sliding whenreturning to engage that pin and which cam thereby directs or lifts thepawl over the pin so that the socket or seat 33 of the pawl will be inposition to engage the pin upon the return stroke.

The carriage 5 is provided at its rear end with a housing 35- which,together with the back end of the head at, completely incloses theratchet mechanism for rotating the head and keeps the same free fromdirt and grit.

'While the tool is being held up to the work the turret head 45 islocked in position against rotary movement by a bolt 36 arranged toengage in any one of a series of sockets 37 formed in the rear face ofbearing shoulder 8 and being equal in number to the number of toolholders or sockets 3. This bolt 36 is mounted to slide in the carriage 5and is shot into position when not otherwise restrained by suitablemeans, such as a spring 38, situated in a socket 39 in one end thereofand bearing against a stop 40 on the end of the carriage. The spring 39is compressed and the bolt 36 withdrawn from the socket 37 at the propertime, as the carriage returns from its advanced position by a dog llpivoted to the carriage 5 and having one end arranged in a slot 12 inthe bolt 36 so as to withdraw the bolt and the other end arranged toengage a shoulder or trip 43 lo- The lever 20 is piv cat-ed on the bedor some part fixed with re- I lation to the bed, as the carriage 5 makesits return movement. This dog 41 as it passes back and forth over thetript3 in what might be called a brushing movement is prevented fromgetting out of position by a spring 44: which engages with the tooth ornotch 45 in one end of the dog as the carriage moves toward the work,thereby forcing the dog downward but with a yielding pressure whichpermits it to pass over the trip 43 but compels it to assume a positionwith its upper end turned toward the right hand end of the slot 12 whenthe carriage 5 starts its return movement so that the lower end of thedog will be in position to again engage the trip 43.

In order that the invention may be understood by those skilled in theart, the details of an exemplification thereof have been thusspecifically described, but

WVhat I claim as new is In a lathe of the class described, thecombination of a frame, a fixed cam plate upon said frame, a fixedshoulder upon said frame, a reciprocating carriage mounted upon saidframe, a rotatable turret-head mounted in said carriage, a peripheralflange upon said turret-head having bolt sockets, means mounted uponsaid carriage and ed operating with said fixed cam plate to rotate saidturret-head periodically, a bolt mounted in said carriage, a springmember holding said bolt normally in contact with said socketedperipheral flange to lock said turretshoulder and having its oppositeextremity cooperating with the fixed shoulder upon said frame at eachreciprocation of said carriage to draw said bolt from its normal lockingposition.

In testimony whereof I have signed my name to this specification, in thepresence of two subscribing witnesses, on this 28th day of September'A.D. 1908.

CLARENCE B. ATWVOOD.

lVitnesses:

DAVID PATTON, WVILLIS G. Brown.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

